James a



(No Model.)A

AJ. A. MALONBY.

PNBUMATIG SIGNAL BELL. No. 347,184. Patented Aug. 10, 1886.

mmmnnn UNITED STATES PATENT OEEicE JAMES A. MALONEY, OF `.VASHINGTON, D. C., ASSIGNOR TO TI-IE PNEUMATIC SIGNAL AND TELEPHONE COMPANY, OF SAME PLAGE.

PNEUMATIC SIGNAL-BELL.

SPECIFICATION forming part of Letters Patent N'o. 347,184, dated August 10, 1886.

Application tiled October 24, i885. Serial No. 180,883. (No model.)

To all whom it may concern:

Be it known that I, J AMES A. MALONEY, a citizen ofthe United States, residing at Tashington, in the District of Columbia, have invented certain new and useful Improvements in Pneumatic SignaLBells; and I do hereby exact description ot' the invention, such as will enable others skilled inthe art to which to it appertains to mak'e and' use the same.

The obj eet of this invention is to construct a signal-bell to be operated by compressed air as is .common to electric bells.

hereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, which form a part of this specification, Figurel is a front 2o elevation partly in section; Fig. 2, a longi-A tudinal section of the air-pump, and Fig. 3 a side view of the support for the pistonrod.

Reference being had to the drawings and the letters of reference marked thereon, A repre- Sents an air-pump provided with a piston, B, a rod, C, a disk or pushbutton, D, and a spring, E, for returning the piston toits normal position. The removable head F ol" the cylinder A is provided with small apertures av 3o a, for relieving that end of the cylinder of air when vthe piston is being returned by the spring, and in the opposite head ofthe cylin der is formed a recess or pocket, b, which supports one end of the spring E.

G represents another cylinder interposed between the air-pump and the vibrating bellhammer, and communicates with the former by means of a tube, H, which may be of any suitable material--slich as metal or rubberandv conducts the air from the pump to the cylinder where it operates against the piston I which is cupshaped and provided with a long bearing-surface formed by the annular flange o which projects at a right angle from the disk d of the piston. This extended bearing-surface of the piston enables me to dispense with packing around its periphery and forms a chamber within the walls ot' the piston to receive the impact of and retain the motor 'iiuid 5o during the outstroke of the piston. To the 2 apparatus is attached.

The invention consists in the constructionsV disk d of the piston I is secured a rod, K, which is provided with a series ot' teeth, e, forming a rack with which the projection f on j the springf' of the short arm g ot' the bifurcated vibrating lever L engages. Thespring j is secured to the arm g by brazing or in any declare the following to be a full, clear, and

other suitable manner well known to metal workers. The rod K is supported and held in 'position by means of an adjustable arm, l1, which is pivotally secured upon a screw or 5o pin, t', which enters the board X to which the From the arm h. projects a stud, k, which is surrounded by a re` volving sleeve, l, which is held in place by a screw, Z', andupon which the piston-rod rests. 65 The sleeve forms an anti-friction bearing for the rod. To adjust the arm 7L and the stud k secured thereto, the screw@l is slackened in its seat formed in the board X, and the arm moved until the sleeve Z on the stud k bears against the under side of the rod K and sustains the weight thereof, when the screw 't' is again tightened and the arn h securely held .in position. The vibrating lever L is fulcrumed at m upon a step, M, also secured to the board X, and thelong curved arm n. of the lever is provided with a hammer, o, foi-striking the bell N.

By the arm a being made to project out farther from the fulerum than the arm g the S0 gravity of the arm n and the hammer o keeps the projection j of thc spring j" in constant contact with the rack formed on the rod K.

It will also be observed that by placing the fulcrnin of the vibratory lever oli one side of 8 5 both of its arms the gravity of the entire lever is brought into use to keep the short arm in constant contact with the rack.

The several parts being constructed substantially as described, the operation is as 9o follows: The pistonB of the air-pump being pushed in by the hand of the person desiring to give a signal, the air in the pump-cylinder is forced through the pipe H into the cylinder G, and forces the piston I outward, causing the rack on the rod K to engage with the spring j" and vibrate the lever L, thus causing the hammer o to strike the bell N a number of strokes in rapid succession, and producing a rattling sound in every respect like that comroo mon to electric signallbells. The outstroke of the piston I compresses air between the disk Z and the cylindcnhcad through which the rod passes. rlhe instant the operator removes his hand or thumb from the push-button D the resiliency of the spring returns the pumppiston to its normal position, and permits the air on the flanged side ot' the piston I in the cylinder G to expand, when the air compressed by the outstroke ol` said piston l will expand and return the piston, and cause the rack on the rod li to again engage with the spring j" and continue the striking of the bell. lt will be observed that the bell is struck by both strokes ot the piston l, that they are ei't'ceted by compressed air acting upon each side ofthe piston, and that the strokes ot' the bell are con tinuous from the beginning of the outstroke to the end ol the return-stroke.

I do notl limit lnyselt' to the use of the spring` arm 1" ot' the vibrating level' L, as the arm g may have a projection formed on it to engage with the teeth c on the rod K. By means of the arm 71, stud t', and sleeve Z, the rod K can be adj ust cd to a nicet y, and kept i n perfeet line, while the sleeve t'orms au anti-frietion bearing for it, thus rendering the operation of the piston l very sensitive and effectual.

I am aware ot' a bell having a lever, one arm ot' which strikes the bell and the other engages with arack upon a wimlowsash, and is held i 11 contact therewith by a spring.

Having thus fully described my invention, what l claim is-g 1. 'lhe combination ot` a cylinder having a rod provided with a rack, an adjustable support for the rod, and a \f'ibratiug lever, substantially as described.

2. The combination of a cylinder having a rod provided with a rack, an adjustable support l'or the rod, carrying an antifriction bearing, a vibrating lever, and a bell, substantially as described.

3. 'lhe combination ot' a cylinder having a close head, apistou provided with a rod projecting t'rom one side ot' the head or disk, and with a cylindrical tlange on the opposite side, whereby a chamber is formed within the walls ol' the piston to receive the impact ot' the motor tluid and retain the saine, a vibrating lever, and a bell,substantially as described.

4. rlhe combination, with a cylinder provided with a close head, of a piston and its rod having a rack thereon, a bifurcated vibrating lever, one arm et' which engages with said rack and the other strikes the bell, and a fulcrum for said lever on one side of both arms, whereby the rack and one arm of the lever are held in constant working contact by the gravity ofthelevcr, substantially as described.

5. In a pneumatic signalsbell, a-lever, one arln of which carries a hammer and the other engages with a rack on a piston-rod, in combination with an air-pump and a cylinder having a close head through which' the rod, works, and interposed between the lever and the pump, the piston of which is operated in one direction by air compressed in said pump, and returned by the expansion of ai r between the piston andthe close head in said cylinder, compressed by the outstroke of thc piston, substantially as described.

6. The combination ot' abell, a cylindcigand piston, the rod of' which is provided with a rack, a vibrating lever having an arm engaging with the rack, a curved arm carrying a hammer, and a fulcrum on one side ot' both arms, whereby the weight ot' said level' will keep the short arm in constant contact with the rack, substantially as described.

7. The combination of a bell, a movable rack, a bifurcated lever having a short arm engaging with the rack, a long eulved arln carrying a hammer, and a fulerum on one side of both arms, whereby the short arm is keptin constant contact with the rack by gravity ot' the lever, substantially as described.

8. Tile combi nation ot'a bell,a rod and a rack, and a bifurealed vibrating lcverfulerumed on one side ofboth arms, the short arm provided with a spring having a projection formed thereon and engaging willi the rack, substantially as described.

9. The combination ot' a bell, a horizontal cylinder having a rod provided with a series ot` teeth forming a rack, a supportt'or said rod, and a bifureated vibrating level l'ulerumed on one side of both arms, one arm ot' which carries a hammer andthe other is in constant contact with the rack and eteetsa continuous ringing ofthe bell during both strokes of the pistou` substantially as described.

10. The combination ot" a bell, a rod pro vided with a rack, and abil'urcated lever both arms ot' which project from one side of the fulerunl, the .short arm engaging with the rack and the long one carrying a hammer and arranged to keep the former in workingr contactwith the rack by the gravity ot` the lever, substantially as described.

In testi mouy whcreot' l al'tix my signature in presence of two witnesses.

JAMES A. MALONEY.

Vitncsses:

S. A. TERRY, XVM. E. DYRE.

IIO 

